Pulley removing device



Oct. 23, 1962 A. BURROWS 3,059,327

PULLEY REMOVING DEVICE Filed June 22, 1959 IN VEN TOIL ALLEN BURROWS BYATTO R N EY United States Patent 3,059,327 PULLEY REMOVING DEVICE AllenBurrows, Providence, R1. (38 James St., East Providence, RI.) Filed June22, 1959, Ser. No. 822,020 3 Claims. (Cl. 29-258) My present inventionrelates to the tool art and more particularly to a device for removing agenerator pulley for repairs.

The principal object of the present invention is to provide a device foreasily and rapidly removing the pulley from a generator shaft.

Another object of the present invention is to provide a device whichutilizes both pressure and shock for removing the pulley from agenerator.

Another object of the present invention is to provide a simple andeasily operable device for removing the pulley from the generatorwithout distortion.

A further object of the present invention is to provide a device forremoving a generator pulley which is simple in construction and easy andeconomical to manufacture and assemble.

With the above and other objects and advantageous features in View, myinvention consists of a novel arrangement of parts more fully disclosedin the detailed description following, in conjunction with theaccompanying drawings and more particularly defined in the appendedclaims.

In the drawings,

FIG. 1 is a perspective view of the device for removing the generatorpulley in operable position.

FIG. 2 is a longitudinal section of the device in inoperable position.

FIG. 3 is an exploded perspective View of the device.

In the repair of automotive generators it is usually found necessary toremove the generator pulley. This pulley is retained on the shaft byfriction. The usual method is to supply a clamp for holding the pulleyand hammering at the end of the shaft. However, this is a very awkwardposition and it is difficult to clamp the pulley. Another method is toprovide a three jaw clamp which holds the pulley While applying pressureon the shaft. This method frequently distorts the pulley or the shaft orboth. The present invention is designed to provide a simple device whichutilizes the best features of both methods. The, device of the presentinvention is designed to simply and quickly clamp the generator pulley,apply pressure on the shaft, and then apply a hammering or a shockingaction to break the friction grip and remove the pulley.

Referring more in detail to the drawings, the device comprises a basemember preferably of cast metal and having spaced ears 11 integrallyformed at each end through which screws 'or bolts 12 may be inserted tomount the device on a wall or ona table. The device is illustrated inposition to mount on a wall. However, it can be turned 90 degrees,mounted on a table, and will operate from that position. Integrallyformed with the base 10 at the forward edge thereof is a tapered arcuateflange 13 having a semicircular shape. The base may be provided with astrengthening rib 14 extending parallel with the forward edge of theflange 13. Extending integrally laterally from the base 10, at each sideedge is a heavy ear portion 15 on a transverse line rearwardly of theforward ends of the flange 13. The ears 15 have longitudinal openingstherein in which a pair of shafts 16 are mounted. -Each shaft 16 islocked in itsear 15 by passing a cotter pin 17 through the portion 15and shaft 16 as shown in FIG. 1. The shafts 16 are thus retained rigidlyin spaced parallel relation and the distance be Patented Oct. 23, 1962ice tween the shafts is greater than the largest size of pulley to beremoved.

I now provide an A-shaped frame 18 which may also be in the form of anintegral metal casting. The frame 18 is provided with slanted side walls19 each terminating at its lower end 20 with a bearing portion having alongitudinal opening with a diameter slightly greater than the diameterof the shafts 16. The frame 18 is thus slidably mounted on the shafts 16and can be readily moved along the shafts. The frame 18 is provided witha lower integral transverse brace 21 having a U-shaped central cut outportion 22 in vertical alignment with the top center of the frame 18.Adjacent to the top of the frame 18 but spaced therefrom is a secondshort transverse bar or brace 23 having a central opening. The bar 23 isprovided with inwardly extending wall portions 24 extending from eachend towards each other as shown in FIG. 1. The top of the frame 18 isprovided with a flattened portion 25 having a central opening 26 invertical alignment with the opening in the bar 23 and of the U-shapedcut out 22 in the bar 21.

Mounted on the shafts 16 is a third casting 27 which comprises atransverse body portion having end bearings 28 with transverse openingsof larger diameter than the shafts 10 so that it will slide freely onthe shafts 16. A wing bolt 29 extends through the portion 28 at each endso that the member 27 can be locked in any desired position along theshafts 16. The member 27 is arcuate in the center portion curvingopposite the flange 13 on the base 10 and complementary to it. It isprovided with a tapered horizontal flange 30 similar to the flange 13with the ends 31 extending forwardly of the portions 28 as shown in FIG.2.

I now provide an elongated threaded bolt 32 of smaller diameter than theframe opening 26 and the opening in the brace 23. A nut 33 whichthreadedly engages the bolt 32 is positioned on the brace 23 so that thebolt 32 passes through the opening 26, threadedly engages the nut 33,then passes through the opening in the brace 23 and extends through theU-shaped portion 22 on the brace 21. The lower end of the bolt 32 may beunthreaded. Now referring to FIG. 1 the nut 33 is preferably rectangularand of such size that it can be positioned between the portions 24 butcannot be rotated between the portions 24. Also, referring to FIG. 2,the distance between the top of the frame 18 and the brace 23- isgreater than the thickness of the nut 33 leaving a space between the nutand the top of the frame.

In use, the generator shown in dotted lines in FIG. 1 is positioned sothat the pulley is in a plane in alignment with the flanges 13 and 30.The pulley is pushed towards the base until the groove in the pulleyengages the flange 13 in the base. The member 27 is then pushed inwardlyuntil its flange 31 enters the groove in the pulley on the oppositeside. The curvature of the flanges are such that they will engage morethan half the circumference of the pulley grooves. With the flangesentering the pulley groove the Wing nuts 29 are tightened to lock thepulley in place. The frame 18 is now slid along the shafts 16 until thebolt 32 is in vertical alignment with the pulley shaft. The bolt 32 isnow turned clockwise, the threads engaging the nut 33 which cannot turn.When the bot-tom end of the bolt 32 engages the pulley shaft on thegenerator additional movement will lift the bolt 32 upwardly against thetop of the frame 18 as shown in FIG. 1. This is so because the bolt 32is not threaded into the frame. The space is now between the brace 23and the underside of the nut 33; The bolt 32 is now tightened to providea pushing strain on the generator shaft. However, it is not tightened toa point Where the pulley or the shaft will become distorted. A

hammer can now be used sharply to break the frictional engagementbetween the pulley and the shaft. It will be noted that the blow of thehammer will not strain the frame 18 or affect the threads on the bolt32. Since the bolt is actually loosely mounted in the frame it cantravel downwardly the distance between the bottom of the nut 33 and thebrace 23. This is suflicient to cause a separation of the pulley fromthe shaft. The top of the A-frame 18 and the brace 23 help to align thebolt 32 and keep it from bending. A tight fit at this point is thereforeunnecessary. It will be found in actual use that it is unnecessary totighten the wing nuts 29 except in the most stubborn cases. The pulleyis placed in position, the member 27 pushed inwardly and the bolt 32tightened in a matter of minutes.

The device of the present invention can be used as a puller to remove Vtype grooved light weight pulleys made of sheet iron or non-ferrousmetal in any construction where the pulley will tend to bend or fracturewhen excessive pressure is applied. The conventional three jaw pullercommonly used, will ruin these V type, because they grip the pulley farout on the outer periphery. A heavy pull with this type puller will bendthe grooves of the pulley and fracture the pulley clear to the hub. Onmost generators the jaws are too thick to go between the pulley and theend plate. Also, most arbor presses will not take these generatorpulleys because the end plates are too big to go into the press.

The puller of the present invention grips the pulley down into thebottom of the grooved V nearest to the hub where the pulley is thestrongest, because that is where the flanges that make up the pulley arefastened together. The device of the present invention has a wrap aroundeffect which in most cases will contact from 75% to 100% of thecircumference of the pulley. This type of contact, plus a steadycontinuous applied pressure by the bolt, makes the shocking actionextremely effective in removing the pulley without damage.

I have thus provided a simple and effective device for removing agenerator pulley from the shaft using pressure and a sharp blow. Thehammering blow on the bolt does not wear the threads and the deviceprovides a positive clamping action in a simple inexpensiveconstruction. The device will operate either horizontally or verticallyand can be used to remove other types of discs and pulleys from shafts.Other advantages of the present invention will be readily apparent to aperson skilled in the art.

I claim:

1. A device for removing a pulley wheel from a shaft comprising a basemember, spaced parallel supports extending forwardly from said basemember, a clamping member slidably mounted on said supports forretaining a pulley wheel having a peripheral groove between saidclamping member and said base member, and means slidably mounted on saidsupports between said base member and said clamping member for applyingpressure on the pulley wheel shaft at right angles to a plane throughsaid parallel supports, said pressure applying means comprising anA-shaped frame extending vertically from said supports and havingbearing portions at its bottom ends slidable on said supports andextending at right angles to a plane through said supports, spacedparallel transverse braces extending between the sides of said frame,said frame and braces having vertically aligned openings, and a threadedbolt extending vertically through said openings, said openings being ofgreater diameter than said bolt, and a nut threaded on said bolt andpositioned between the top of said frame and the upper of saidtransverse braces, said nut being thinner than the space between theupper end of said frame and said upper brace whereby said nut is free tomove vertically between the upper end of said frame and said upperbrace, said nut being trapped and held captive between said upper to hitthe top of the bolt 32 end of said frame and said upper brace, theopening in said upper brace being smaller than the outer dimension ofsaid nut, and means integral with said frame for restricting rotatingmovement of said nut, said base member comprising a generally elongatedmember having a bearing portion at each end for retaining said supports,the forward edge of said base member between said supports forming anarcuate flange for engaging the groove of the pulley wheel.

2. A device for removing a pulley wheel from a shaft comprising a basemember, spaced parallel supports extending forwardly from said basemember, a clamping member slidably mounted on said supports forretaining a pulley wheel having a peripheral groove between saidclamping member and said base member, and means slidably mounted on saidsupports between said base member and said clamping member for applyingpressure on the pulley wheel shaft at right angles to a plane throughsaid parallel supports, said pressure applying means comprising anA-shaped frame extending vertically from said supports and havingbearing portions at its bottom ends slidable on said supports andextending at right angles to a plane through said supports, spacedparallel transverse braces extending between the sides of said frame,said frame and braces having vertically aligned openings, and a threadedbolt extending vertically through said openings, said openings being ofgreater diameter than said bolt, and a nut threaded on said bolt andpositioned between the top of said frame and the upper of saidtransverse braces, said nut being thinner than the space between theupper end of said frame and said upper brace whereby said nut is free tomove vertically between the upper end of said frame and said upperbrace, said nut being trapped and held captive between said upper end ofsaid frame and said upper brace, the opening in said upper brace beingsmaller than the outer dimension of said nut, and means integral withsaid frame for restricting rotating movement of said nut, said basemember comprising a generally elongated member having a bearing portionat each end for retaining said supports, the forward edge of said basemember between said supports forming an arcuate flange for engaging thegroove of the pulley wheel, said clamping member comprising an elongatedmember having a bearing portion at each end, said supports passingthrough said bearing portions,

the edge of said clamping member facing said base member having anarcuate flange for engaging the groove of the pulley wheel.

3. A device for removing a pulley wheel from a shaft comprising a basemember, spaced parallel supports extending forwardly from said basemember, a clamping member slidably mounted on said supports forretaining a pulley wheel having a peripheral groove between saidclamping member and said base member, and means slidably mounted on saidsupports between said base member and said clamping member for applyingpressure on the pulley wheel shaft at right angles to a plane throughsaid parallel supports, said pressure applying means comprising anA-shaped frame extending vertically from said supports and havingbearing portions at its bottom ends slidable on said supports andextending at right angles to a plane through said supports, spacedparallel transverse braces extending between the sides of said frame,said frame and braces having vertically aligned openings, and a threadedbolt extending vertically through said openings, said openings being ofgreater diameter than said bolt, and a nut threaded on said bolt andpositioned between the top of said frame and the upper of saidtransverse braces, said nut being thinner than the space between theupper end of said frame and said upper brace whereby said nut is free tomove vertically between the upper end of said frame and said upperbrace, said nut being trapped and held captive between said upper end ofsaid frame and said upper brace, the opening in said upper brace beingsmaller than the outer dimension of said nut, and means integral withsaid frame for restricting rotating movement of said nut, said supportscomprising shafts each having one end locked in said base member, saidshafts passing through bearing portions on said clamping member and saidA-shaped :frame.

References Cited in the file of this patent UNITED STATES PATENTS ColtaMay 19, 1914 Gaillard Jan. 5, 1915 Shilling Feb. 15, 1921 Paulson Aug.8, 1922 Florence Feb. 9, 1926 Kap' lan July 7, 1942 FOREIGN PATENTSFrance Nov, 18, 1953

